The purpose of this study is to evaluate whether or not the Hancock II aortic valve will affect the patient’s ability to exercise and carry out daily activities after heart surgery.

The Hancock II valve is an FDA approved valve. It is a stented, porcine valve. It has been used now for over 15 years. For the purposes of this study it is considered investigational in order to collect pre and post operative bicycle breathing data along with echocardiograms while exercising.